import sys

file1=open(sys.argv[1],'r')
file2=open(sys.argv[2],'w')
for line in file1:
    line_list=line.strip().split('\t')
    line_list[3]='Chr'+line_list[3][-2:]
    for i in line_list:
        file2.write(i+'\t')
    file2.write('\n')
